The report, which looked at the effects of the coronavirus crisis on people's well-being, is compiled annually by researchers in the US on the basis of surveys by the Gallup Institute.
According to the report, the happy Finns are followed by: Denmark, Iceland, Switzerland, the Netherlands, Luxembourg, Sweden, Norway, Israel and New Zealand.
Austria is in 11th place, Australia is 12th, Ireland is 13th, Germany is 14th, 15th place goes to Canada and the US follows in 16th place.
The United Kingdom comes in at 17th, South Korea is at 59th and China is at 72nd.
At the bottom of the list of more than 150 countries is conflict-ridden Afghanistan.
Other big losers include crisis-torn Lebanon and Venezuela.
Serbia, Bulgaria and Romania, on the other hand, made the biggest leaps forward.
The report is based on data from the past three years.
The researchers noted a significant increase in so-called acts of kindness during the pandemic: "Helping strangers, volunteering and donations in 2021 were strongly up in every part of the world, reaching levels almost 25 per cent above their pre-pandemic prevalence," they said.
"This surge of benevolence, which was especially great for the helping of strangers, provides powerful evidence that people respond to help others in need, creating in the process more happiness for the beneficiaries, good examples for others to follow, and better lives for themselves," the report said.